[svn-r29226] HDFFV-9552: merge in java code.
This commit is contained in:
Allen Byrne
289
java/examples/datasets/H5Ex_D_Compact.java
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289
java/examples/datasets/H5Ex_D_Compact.java
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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
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* Copyright by The HDF Group. *
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* Copyright by the Board of Trustees of the University of Illinois. *
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* All rights reserved. *
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* *
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* This file is part of HDF5. The full HDF5 copyright notice, including *
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* terms governing use, modification, and redistribution, is contained in *
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* the files COPYING and Copyright.html. COPYING can be found at the root *
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* of the source code distribution tree; Copyright.html can be found at the *
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* root level of an installed copy of the electronic HDF5 document set and *
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* is linked from the top-level documents page. It can also be found at *
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* http://hdfgroup.org/HDF5/doc/Copyright.html. If you do not have *
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* access to either file, you may request a copy from help@hdfgroup.org. *
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* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
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/************************************************************
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This example shows how to read and write data to a compact
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dataset. The program first writes integers to a compact
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dataset with dataspace dimensions of DIM_XxDIM_Y, then
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closes the file. Next, it reopens the file, reads back
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the data, and outputs it to the screen.
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************************************************************/
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package examples.datasets;
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import java.util.EnumSet;
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import java.util.HashMap;
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import java.util.Map;
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import hdf.hdf5lib.H5;
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import hdf.hdf5lib.HDF5Constants;
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public class H5Ex_D_Compact {
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private static String FILENAME = "H5Ex_D_Compact.h5";
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private static String DATASETNAME = "DS1";
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private static final int DIM_X = 4;
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private static final int DIM_Y = 7;
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private static final int RANK = 2;
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// Values for the status of space allocation
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enum H5D_layout {
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H5D_LAYOUT_ERROR(-1), H5D_COMPACT(0), H5D_CONTIGUOUS(1), H5D_CHUNKED(2), H5D_NLAYOUTS(3);
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private static final Map<Integer, H5D_layout> lookup = new HashMap<Integer, H5D_layout>();
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static {
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for (H5D_layout s : EnumSet.allOf(H5D_layout.class))
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lookup.put(s.getCode(), s);
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}
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private int code;
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H5D_layout(int layout_type) {
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this.code = layout_type;
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}
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public int getCode() {
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return this.code;
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}
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public static H5D_layout get(int code) {
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return lookup.get(code);
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}
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}
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private static void writeCompact() {
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long file_id = -1;
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long filespace_id = -1;
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long dataset_id = -1;
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long dcpl_id = -1;
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long[] dims = { DIM_X, DIM_Y };
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int[][] dset_data = new int[DIM_X][DIM_Y];
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// Initialize data.
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for (int indx = 0; indx < DIM_X; indx++)
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for (int jndx = 0; jndx < DIM_Y; jndx++)
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dset_data[indx][jndx] = indx * jndx - jndx;
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// Create a new file using default properties.
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try {
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file_id = H5.H5Fcreate(FILENAME, HDF5Constants.H5F_ACC_TRUNC, HDF5Constants.H5P_DEFAULT,
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HDF5Constants.H5P_DEFAULT);
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}
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catch (Exception e) {
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e.printStackTrace();
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}
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// Create dataspace. Setting maximum size to NULL sets the maximum
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// size to be the current size.
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try {
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filespace_id = H5.H5Screate_simple(RANK, dims, null);
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}
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catch (Exception e) {
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e.printStackTrace();
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}
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// Create the dataset creation property list.
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try {
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dcpl_id = H5.H5Pcreate(HDF5Constants.H5P_DATASET_CREATE);
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}
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catch (Exception e) {
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e.printStackTrace();
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}
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// Set the layout to compact.
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try {
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if (dcpl_id >= 0)
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H5.H5Pset_layout(dcpl_id, H5D_layout.H5D_COMPACT.getCode());
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}
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catch (Exception e) {
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e.printStackTrace();
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}
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// Create the dataset. We will use all default properties for this example.
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try {
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if ((file_id >= 0) && (filespace_id >= 0) && (dcpl_id >= 0))
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dataset_id = H5.H5Dcreate(file_id, DATASETNAME, HDF5Constants.H5T_STD_I32LE, filespace_id,
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HDF5Constants.H5P_DEFAULT, dcpl_id, HDF5Constants.H5P_DEFAULT);
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}
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catch (Exception e) {
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e.printStackTrace();
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}
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// Write the data to the dataset.
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try {
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if (dataset_id >= 0)
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H5.H5Dwrite(dataset_id, HDF5Constants.H5T_NATIVE_INT, HDF5Constants.H5S_ALL, HDF5Constants.H5S_ALL,
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HDF5Constants.H5P_DEFAULT, dset_data);
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}
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catch (Exception e) {
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e.printStackTrace();
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}
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// End access to the dataset and release resources used by it.
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try {
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if (dcpl_id >= 0)
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H5.H5Pclose(dcpl_id);
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}
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catch (Exception e) {
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e.printStackTrace();
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}
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try {
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if (dataset_id >= 0)
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H5.H5Dclose(dataset_id);
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}
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catch (Exception e) {
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e.printStackTrace();
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}
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try {
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if (filespace_id >= 0)
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H5.H5Sclose(filespace_id);
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}
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catch (Exception e) {
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e.printStackTrace();
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}
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// Close the file.
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try {
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if (file_id >= 0)
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H5.H5Fclose(file_id);
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}
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catch (Exception e) {
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e.printStackTrace();
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}
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}
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private static void readCompact() {
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long file_id = -1;
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long filespace_id = -1;
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long dataset_id = -1;
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long dcpl_id = -1;
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int[][] dset_data = new int[DIM_X][DIM_Y];
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// Open file and dataset using the default properties.
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try {
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file_id = H5.H5Fopen(FILENAME, HDF5Constants.H5F_ACC_RDONLY, HDF5Constants.H5P_DEFAULT);
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}
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catch (Exception e) {
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e.printStackTrace();
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}
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// Open an existing dataset.
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try {
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if (file_id >= 0)
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dataset_id = H5.H5Dopen(file_id, DATASETNAME, HDF5Constants.H5P_DEFAULT);
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}
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catch (Exception e) {
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e.printStackTrace();
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}
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// Retrieve the dataset creation property list.
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try {
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if (dataset_id >= 0)
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dcpl_id = H5.H5Dget_create_plist(dataset_id);
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}
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catch (Exception e) {
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e.printStackTrace();
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}
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// Print the storage layout.
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try {
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if (dcpl_id >= 0) {
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int layout_type = H5.H5Pget_layout(dcpl_id);
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System.out.print("Storage layout for " + DATASETNAME + " is: ");
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switch (H5D_layout.get(layout_type)) {
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case H5D_COMPACT:
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System.out.println("H5D_COMPACT");
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break;
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case H5D_CONTIGUOUS:
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System.out.println("H5D_CONTIGUOUS");
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break;
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case H5D_CHUNKED:
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System.out.println("H5D_CHUNKED");
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break;
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case H5D_LAYOUT_ERROR:
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break;
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case H5D_NLAYOUTS:
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break;
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default:
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break;
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}
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System.out.println();
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}
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}
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catch (Exception e) {
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e.printStackTrace();
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}
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// Read the data using the default properties.
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try {
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if (dataset_id >= 0)
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H5.H5Dread(dataset_id, HDF5Constants.H5T_NATIVE_INT, HDF5Constants.H5S_ALL, HDF5Constants.H5S_ALL,
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HDF5Constants.H5P_DEFAULT, dset_data);
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}
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catch (Exception e) {
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e.printStackTrace();
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}
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// Output the data to the screen.
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System.out.println("Data for " + DATASETNAME + " is: ");
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for (int indx = 0; indx < DIM_X; indx++) {
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System.out.print(" [ ");
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for (int jndx = 0; jndx < DIM_Y; jndx++)
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System.out.print(dset_data[indx][jndx] + " ");
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System.out.println("]");
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}
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System.out.println();
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// End access to the dataset and release resources used by it.
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try {
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if (dcpl_id >= 0)
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H5.H5Pclose(dcpl_id);
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}
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catch (Exception e) {
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e.printStackTrace();
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}
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try {
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if (dataset_id >= 0)
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H5.H5Dclose(dataset_id);
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}
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catch (Exception e) {
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e.printStackTrace();
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}
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try {
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if (filespace_id >= 0)
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H5.H5Sclose(filespace_id);
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}
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catch (Exception e) {
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e.printStackTrace();
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}
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// Close the file.
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try {
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if (file_id >= 0)
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H5.H5Fclose(file_id);
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}
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catch (Exception e) {
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e.printStackTrace();
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}
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}
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public static void main(String[] args) {
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H5Ex_D_Compact.writeCompact();
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H5Ex_D_Compact.readCompact();
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}
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}
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